Instrument



Feb. 22, 1955 R NpB A EHR ET AL 2,702,549

' INSTRUMENT I Filed Nov. 12. 1953 INVENTORS.

' mutfi 48% MM United States Patent 2,702,549 INSTRUMENT Robert N. Baehr, New Rochelle, and Chester L. Valent, New York, N. Y.

Application November 12, 1953, Serial No. 391,531 1 Claim. (Cl. 128-278) The invention consists of an instrument for securing samples of blood from the human or animal body as required by persons engaged in medical, nursing, hospital or laboratory practice for the purpose of examination or testing. It is superior to other instruments now used for the same purpose in that it accomplishes the object for which it is designed in one single operation and does not require as much manual dexterity and steadiness. It consists of a handle 1 attached to or otherwise a part of piston (simple rod) 2, having a puncturing needle 4 attached to or otherwise made a part of the piston or rod at the lower extremity thereof. The piston or rod is inclosed in a cylinder 3 with such precision as to create a suction in the cylinder below the piston when it is drawn outward from the cylinder. A diagram or drawing of the instrument in elevation is annexed hereto. It may be constructed or made out of glass, plastic or metal or some of the various parts of the instrument may be made out of one of these materials and other parts out of another of these materials.

The instrument will be used as follows: To take a specimen of blood the extremity of the instrument to which the puncturing needle is attached is pressed against a selected area of skin surface; at the same time the lower end of the outer cylinder is held with one hand firmly against this surface While by the other hand the piston is drawn outward withdrawing the puncturing needle from the flesh and at the same time creating a suction in the cylinder which causes a quantity of blood as desired to flow into the cylinder.

We claim:

An instrument for securing samples of blood comprising a cylinder having both ends open, a tightly fitting piston that is longer than the cylinder fitted therein, said piston having an operating handle at one end and a fine puncturing needle of greatly reduced diameter than the piston at the opposite end and extending axially thereof whereby the instrument end having the needle may be firmly pressed against a selected area of the patients skin forming an air tight seal between the skin and the open end of the cylinder, the piston may then be actuated first to thrust the needle into the patients skin, then retracted to withdraw blood from the so punctured area into the cylinder.

References Cited in the file of this patent UNITED STATES PATENTS Sweet Dec. 3, 1912 

